Home / 5,119.20-7,678.80-1,421.43

Finding the Fourth Proportional to 5,119.20, 7,678.80 and 1,421.43

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Solution

The fourth proportional to 5,119.20, 7,678.80 and 1,421.43 is: 2,132.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,119.20 : 7,678.80 = 1,421.43 : x
  2. Step 2: Convert to fraction form
    5,119.20/7,678.80 = 1,421.43/x
  3. Step 3: Cross multiply
    5,119.20x = 7,678.80 × 1,421.43
  4. Step 4: Simplify right side
    5,119.20x = 10,914,852.69
  5. Step 5: Solve for x
    x = 10,914,852.69/5,119.20
  6. Step 6: Final answer
    x = 2,132.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.